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采用Nd:YAG激光对0.5 mm厚的1060纯铝板进行圆弧和直线精密切割时,为消除圆弧和直线切口壁面的粗糙度差异问题,通过显微镜观察圆弧切缝壁面微观形貌,在此基础上建立圆弧简化的数学模型,导出了内、外圆弧壁面粗糙度公式。在相同切割参数下,重点分析切割半径对内、外圆弧和直线壁面粗糙度差异影响规律,结果表明,随切割半径增大,外圆弧壁面粗糙度增大,内圆弧壁面粗糙度减小;当切割半径R≤7 mm时,内、外圆弧粗糙度差异明显;切割半径R>7 mm时,两者粗糙度差异忽略不计。最后,先后利用响应曲面法(RSM)中最小值优化和目标值优化,获得圆弧和直线对应的工艺参数,实际切割测量后粗糙度近似一致,直线和圆弧粗糙度差异消除,此方法证明可行有效。
When using the Nd: YAG laser to cut the 0.5mm-thick 1060 pure aluminum plate, the micro-topography of the arc-shaped kerf wall is observed by microscopy in order to eliminate the difference of the roughness of the circular arc and the straight- Based on the establishment of arc-simplified mathematical model, derive the inner and outer arc wall roughness formula. Under the same cutting parameters, the influence of the cutting radius on the difference of the inner and outer arcs and the linear wall roughness is analyzed emphatically. The results show that with the increase of the cutting radius, the roughness of the outer arc wall increases and the roughness of the inner arc wall decreases When the cutting radius R≤7 mm, the difference of the roughness of the inner and outer arcs is obvious. When the cutting radius R> 7 mm, the difference of roughness between the two is negligible. Finally, the process parameters of circular arc and straight line are obtained by using the minimum value optimization and the target value optimization in response surface methodology (RSM) successively. The roughness after the actual cutting measurement is approximately the same and the difference between the straight line and the arc roughness is eliminated. This method proves Feasible and effective.